Electric controller.



r A. c. EASTWOOD.

ELECTRIC CONTROLLER. APPLIOATION FILED SEPT.24,1910.

Patented N 0v. 14, 191-1.

Q M w w 3 a J r a an m m V UNITED STATES PATENT OFFICE.

ARTHUR C. EASTWOOD. OF CLEVELAND, OHIO, ASSIGNOR TO THE ELEilTRIC CON TROLLER AND MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

Specification of Letters Patent.

Patented Nov. 14, 1911.

Application filed September 24, 1910. Serial No. 583,537.

To all whom it may concern:

Be it known that I, ARTHUR C. EAST" w on, a citizen of the United States, residin at Cleveland, in the county of Ouyahoga and State of Ohio, have invented new and useful Improvements in Electric Controllens, of which the following is a specification.

My invention relates to electric motor controllers of that type in which separately actuated magnetic switches are used to make the proper connections forstarting the motor, operate it in different directions, and vary its speed. It sometimes occurs in the operation of such controllers that when the master controller is moved to the off plished in a number of ways, one of which is shown diagrammatically in the accompanying drawing.

On the drawing, I have shown a pair of reversing switches 5 and 6 operated, respectively, by the windings 5 and 6* and having, respectively, the auxiliary contacts 5* and 6 which are open when the switches 5 and 6 are open. A relay 7 having its contacts in the common return from the windings 5 and 6 is provided, the winding re ceiving positive current from the segment m or n on the master switch M Whose arm 0 is in contact with the positive segment m and may be moved to thealeft so as to contact successively with th; segments m to m, or to the right so (a to contact successively with the segments 72/ to n; The segments m to m and the respective segments in? to n are connected, respectively, to the operating windings 1 to 4: of the respective resistance switches l to 4. The winding 7 a of the switch or relay 7 is connected to the negative main and to the re sistance B, so that, if any of the switches 1 to 4 are closed, the relay winding? is energized and the relay 7 has its contacts open.

segment m,- current flows from the positive segment at through the arm 0, he segment m, the winding 6 and the contacts of the relay 7 to the negative main, "his current causing the winding 6 to close the switch 6. When the arm 0 is moved to the segment m current flows from the positive segment 1a through the winding 1 (ausing the switch 1 to close the motor circ lit whichis as follows: from the positive In iin through the switch 1, the resistance R the motor field F, and the armature A to ll'lB negative main, causing the armature to rotate in a certain direction. Further mwement of the arm 0 step by step to the segments m to m successively energizes the windings 2 to 4 causing the switches 2 to t to successively close and shortcircuit .h'e sections of the resistance in an obvious nanner.

If the arm 0 be moved from the off position so as to engage the segments n to or,

the operation would be the saint as that de-.

scribed except that the winding 5 would be energized, the switch 5 closed, and the armature rotated in the reverse direction.

'If, when the arm 0 is moved to its oft? position, one or more of the s ntches 1 to 4 remain closed, the switch 5 or 6 will open, but the current from the positive main through the closed switch or s Witches and the relay winding 7 would pers st, preventing the excitation of the windings 5" and 6 when the master switch arm 0 3s again, operated. It will be impossible to actuate either switch 5 or 6 after one ofthem has been operated because, as soon as one has operated and the switch 1 has closed, the other is made inoperative by th( opening of the contacts of the relay 7.

I claim:

1. A magnetically-operated switch for connecting a main circuit to 01 re side of a source of current supply, an ac mating and a maintaining circuit for the switch, and means adapted to open the actuating circuit whenever the main circuit is connected to the other side of the source of'st pply at any point. I

2. -A magnetically-operated switch for connecting an electric circuit to one side of a source of current supply, a1 actuating and a maintaining circuit for the switch, means adapted to open the ac mating circuit whenever the main circuit 1s connected cuit' when the switch operates.

3. A magnetically-operated switch for closing an electric circuit, an actuating cir-' cuit and a maintaining circuit for. the switch, one or more other switches for connecting the circuit to a source of supply, and means for opening the actuatin circuit of the magnetically-operated switc when any of the said other switches is closed.

4. In a motor control system, a, magnetically-operated reverser'in circuit therewith, actuating and maintaining circuits for the reverser, a resistance vfor controlling the motor, one or more switches for connecting the resistance to a. source of current supply, and a relay adapted to open the reverser actuating circuit whenever any of the resistance controlling switches closes.

5. In a motor'control system, a magnetically-operated reverser in circuit therewith, actuating and maintaining circuits for the reverser, a resistance for controlling the motor, oneor more switches for controlling the resistance, a relay adapted to open the reverser-actuating circuit when any of the resistance controlling switches are closed, and means for closing the reverser maintaining circuit when the reverser operates. Signed at Cleveland, Ohio, this 19th day of September, A. D. 1910.

' ARTHUR C. EASTWOOD.

Witnesses:

- J L H. HALL,

H. M. DIEMER,

Copies of this platent m tybe obtained forflve cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

